onclite: overlay: Set default hotspot ssid

Added a device specific overlay that changes the default name
from "AndroidAp" to "Redmi 7"

Test: Builds, manually verified name change
Bug: 36368950
Change-Id: I38a5f6fb950d6a45342080bae186a8ed276d94bf
Signed-off-by: Dhina17 <dhinalogu@gmail.com>

overlay/frameworks/base/core/res/res/values/strings.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+** Copyright 2017, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<!-- These resources are around just to allow their values to be customized
+     for different hardware and product builds.  Do not translate. -->
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <!-- Do not translate. Default access point SSID used for tethering -->
+    <string name="wifi_tether_configure_ssid_default" translatable="false">Redmi 7</string>
+</resources>